REG 316*4 1MRB520049-Uen / Rev. F ABB Switzerland Ltd
3-159
The reactances X
A
and X
B
, are defined according to the phase-
to-phase voltages and calculated for turboalternators as follows:
Xx
U
I
K
K
Ad
GN
GN
i
u
=´ ´
3
3
X
xU
I
K
K
B
dGN
GN
i
u
=´
'
2
3
3
In the above equation, x
q
is replaced by x
d
for salient pole units.
K
I
I
i
N
N2
=
1
K
U
U
I
I
u
N
N2
N
N2
==
1
1
3
3
where:
x
d
, x
d
' unsaturated synchronous reactance and satu-
rated transient reactance of the generator in p.u.
x
q
synchronous reactance in p.u.
U
GN
, I
GN
rated generator voltage and current
K
i
c.t. ratio
K
u
v.t. ratio
U
N1
, U
N2
v.t. rated voltages
I
N1
, I
N2
c.t. rated currents
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